Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb16bd1ac259a07…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 10:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e067aabc623ee8483e969937e3346250 SHA-1: 37f18690cbf2b3695b82ad36633f772bd2e5041c SHA-256: fcb16bd1ac259a0733828647ee485b3b3601ef1e51b7cbd2917c214925a2065e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'pixomot.ru', suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and the presence of embedded links indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=how+do+i+transfer+from+old+phone+to+new+phone PDF link annotation
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/mebanarelemufirupowuk.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/bigiker.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/vemisorawefejimikiz.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/73633697620.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/58771736292.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5b1e99212---14961208317.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/34325381010.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/76652434959.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73349699245.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/metuduzujobipajaziri.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2c57765dc2a021c46cd66cc6cd12ddc6/75773741581.pdfIn PDF document text
    • http://devison-matras.com/upload/file/79323210437.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/melukolozitin.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/lovitaxirisetexu.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/winotepunivow.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/91305993610.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/49062676454.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/69274061560.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/74278885099.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/95641409007.pdfIn PDF document text
    • http://lblussana.it/images/file/28322086395.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/dawivadoxidox.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/64638160818.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210910/file/60159558871.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xekizilularerafovig.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/luvosaj.pdfIn PDF document text
    • http://centromp.it/userfiles/files/57180161636.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 10840 bytes
SHA-256: 2ba3d04763632549589a8783c3570cf603ab5f3a5cce80e88b52e84c27326a61
font_02_sfnt_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 14844 bytes
SHA-256: dc3a888308fe39d0228d6152152491a938f44c377e681d69a19e3db9d569f367